Method and Device for Providing Multimedia Service in Electronic Device

2. The electronic device of claim 1, wherein the first message or the second message comprises a string-based message included in a real-time transport control protocol (RTCP) source description packet (SDES) packet, and the string-based message is configured for a canonical name (CNAME) of the RTCP SDES packet.

5. The electronic device of claim 3, wherein the third identifier comprises at least one specific value corresponding to a quality improvement function that the electronic device supports from among quality improvement functions of picture loss indication (PLI), generic negative acknowledgement (NACK), frame loss indication (FLI), or temporary maximum media stream bit rate request (TMMBR), which are defined in the AVPF.

7. The electronic device of claim 3, wherein the instructions cause the processor to, if the counterpart electronic device is a device available for the multimedia service applied the quality improvement function, enable at least one quality improvement function matching the counterpart electronic device, by referring to the third identifier.

8. The electronic device of claim 1, wherein the first message or the second message comprises a string-based message included in an RTCP application (APP) packet or RTP Extension.

10. The method of claim 9, wherein the first message or the second message comprises a string-based message included in a real-time transport control protocol (RTCP) source description packet (SDES) packet, and the string-based message is configured for a canonical name (CNAME) of the RTCP SDES packet.

13. The method of claim 9, wherein the first message or the second message further comprises a string-based message included in an RTCP application (APP) packet or RTP Extension.